Travel behavior changes after network disruption as well as after the replacement of disrupted links are not well-understood. The first table shows the number of river crossing trips by type of facility before and after the collapse and the reopening.
We discover 46,000 lost trips daily after the collapse (nearly a third of what the I-35W Bridge had carried), and 20,000 found trips after the new bridge opened. Those lost trips may not have been made, or more likely, found different destinations not requiring a river crossing. This provides additional evidence to the phenomenon of induced demand.
|Bridge Collapses: 1-Aug-2007||Bridge Reopens: 18-Sep-2008|
|Bridge||Before||After||Change||Before Reopen||After Reopen||Change|
|Daily VHT||Daily Difference||Value|